| commit | 5f191b62b414c0b02a65a41a915c8441920b4a8a | [log] [tgz] |
|---|---|---|
| author | Android Build Coastguard Worker <[email protected]> | Fri Sep 24 01:05:17 2021 +0000 |
| committer | Android Build Coastguard Worker <[email protected]> | Fri Sep 24 01:05:17 2021 +0000 |
| tree | 7be04ab17626897820feb54c5e7fb94b26b51a11 | |
| parent | 437735b25abd909de3d5d3fd456b676e62b18a03 [diff] | |
| parent | 91ca2bf2b03f1c93e25ac6822eee3de256935983 [diff] |
Snap for 7761491 from 91ca2bf2b03f1c93e25ac6822eee3de256935983 to tm-d1-release Change-Id: I81cde1b1931bde5b5b30bef13c0af64cc849203f
This crate provides fast functions for printing integer primitives to an io::Write or a fmt::Write. The implementation comes straight from libcore but avoids the performance penalty of going through fmt::Formatter.
See also dtoa for printing floating point primitives.
Version requirement: rustc 1.0+
[dependencies] itoa = "0.4"
use std::{fmt, io}; fn demo_itoa_write() -> io::Result<()> { // Write to a vector or other io::Write. let mut buf = Vec::new(); itoa::write(&mut buf, 128u64)?; println!("{:?}", buf); // Write to a stack buffer. let mut bytes = [0u8; 20]; let n = itoa::write(&mut bytes[..], 128u64)?; println!("{:?}", &bytes[..n]); Ok(()) } fn demo_itoa_fmt() -> fmt::Result { // Write to a string. let mut s = String::new(); itoa::fmt(&mut s, 128u64)?; println!("{}", s); Ok(()) }
The function signatures are:
fn write<W: io::Write, V: itoa::Integer>(writer: W, value: V) -> io::Result<usize>; fn fmt<W: fmt::Write, V: itoa::Integer>(writer: W, value: V) -> fmt::Result;
where itoa::Integer is implemented for i8, u8, i16, u16, i32, u32, i64, u64, i128, u128, isize and usize. 128-bit integer support requires rustc 1.26+ and the i128 feature of this crate enabled.
The write function is only available when the std feature is enabled (default is enabled). The return value gives the number of bytes written.